Perovskite based devices are being explored not only for Photovoltaics but also for various opto- electronic applications like light emitting diode (LED) and solid-state memories. In all these applications, device electrostatics is influenced by ion migration, which have long term implications regarding stability and performance degradation.
The behaviour of mobile ions in perovskite devices is often complex and surprising.
In this article, we show
that for small signal switching, the time delay in current response scales inversely
with the ion mobility
whereas for large signal switching the time delay is independent of ion mobility and
entirely dependent
on electronic dipoles. These results and the corresponding theory are backed by
numerical simulations
(in-house developed code) and experimental observations from Prof. Dinesh Kabra’s
group and data from
various labs. If you are curious to know more, please refer to the paper
Saketh Chandra, T.; Singareddy, A.; Hossain, K.; Sivadas, D.; Bhatia, S.; Singh, S.;
Kabra, D.; Nair, P. R. Ion
Mobility Independent Large Signal Switching of Perovskite Devices. Appl. Phys. Lett.
2021, 119 (2).
https://doi.org/10.1063/5.0051342
Scilight article:
https://doi.org/10.1063/10.0005670
Corresponding author: Prof. Pradeep R. Nair, EE, IIT Bombay;
Email:
prnair@ee.iitb.ac.in
